1 files changed, 127 insertions, 0 deletions
diff --git a/nuttx/sched/sched_garbage.c b/nuttx/sched/sched_garbage.c
new file mode 100755
index 000000000..6dc1a5c88
--- /dev/null
+++ b/nuttx/sched/sched_garbage.c
@@ -0,0 +1,127 @@
+/****************************************************************************
+ * sched/work_garbage.c
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+
+#include <stdlib.h>
+
+#include <nuttx/mm.h>
+
+#include "os_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+/****************************************************************************
+ * Name: sched_garbagecollection
+ *
+ * Description:
+ *   Clean-up memory de-allocations that we queued because they could not
+ *   be freed in that execution context (for example, if the memory was freed
+ *   from an interrupt handler).
+ *
+ *   This logic may be called from the worker thread (see work_thread.c).
+ *   If, however, CONFIG_SCHED_WORKQUEUE is not defined, then this logic will
+ *   be called from the IDLE thread.  It is less optimal for the garbage
+ *   collection to be called from the IDLE thread because it runs at a very
+ *   low priority and could cause false memory out conditions.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void sched_garbagecollection(void)
+{
+  /* Check if there is anything in the delayed deallocation list. If there
+   * is deallocate it now.  We must have exclusive access to the memory manager
+   * to do this BUT the idle task cannot wait on a semaphore.  So we only do
+   * the cleanup now if we can get the semaphore -- and this should be possible
+   * because if the IDLE thread is running, no other task is!
+   */
+
+#ifdef CONFIG_SCHED_WORKQUEUE
+  mm_takesemaphore();
+#else
+  if (mm_trysemaphore() == 0)
+#endif
+    {
+      while (g_delayeddeallocations.head)
+        {
+          /* Remove the first delayed deallocation. */
+
+          irqstate_t saved_state = irqsave();
+          void *address = (void*)sq_remfirst((FAR sq_queue_t*)&g_delayeddeallocations);
+          irqrestore(saved_state);
+
+          /* Then deallocate it */
+
+          if (address)
+            {
+              free(address);
+            }
+        }
+      mm_givesemaphore();
+    }
+}
+